Hindsiclava calligonoides

The line of demarcation between spire and the protoconch is indicated by the protractive thickening of the shell and by the introduction of the axial sculpture.

There are 20 axials upon the body of the holotype, rather low, sharply pinched, restricted entirely to the area in front of the fasciole, on the body persistent to the base of the pillar, equal and uniform in strength throughout their extent and separated from one another by wide, concave intercostals.

The primaries in front of the fasciole number normally five on the penultimate whorl, 12 to 15 on the body whorl and columella, very low, broad, overriding the axials, separated by interspirals of approximately the same width in which are intercalated 2, 3, or even 4 microscopically fine secondaries.

The posterior fasciole is broad, sharply defined, smoothly concave, free from axial sculpture except for conspicuous incrementals.

A similar striation generally developed behind the sutural carina, which is sharply elevated but not crowned by a well-defined cord.

[2] Fossils of this marine species were found in Miocene strata in the Shoal River Formation, Florida, US.